Cooking-stove oven



(No Model B. MAGKELLAR 0001mm STOVE OVEN.

No. 433,480. Patented Aug. 5, 1890 J-(Z LA- g' WITNESSES: llVl/E/VTOR W W/MAZ %,//@m 6?. BY

ATTORNEY.

UNITED STATES ROBERT MACKELLAR, OF PEEKSKILL, NEW YORK.

COOKING-STOVE OVEN.

SPECIFICATION forming part of Letters Patent No. 433,480, dated August 5, 1890. Application filed August 9, 1887. Serial No. 246,547. (No model.)

To aZZ whom it ntay concern:

Be it known that I, ROBERT MACKELLAR, a citizen of the United States, residing in Peekskill, in the county of \Vestchester, and State of New York, have invented new and useful Improvements in Cooking-Stove Ovens, of which the following a specification.

The object is attained by the means illustrated in the accompanying drawings, in which similar letters refer to similar parts throughout the several views.

Figure 1 shows the interior of an oven with a part of the front plate removed, revealing the method of lining the oven. Fig. 2 is the reverse side of a section of the oven-lining.

The interior of the oven I line with a material similar to the panel 0, made with a backing in such form that the entire lining does not lie directly in contact with the metal case of the oven. Fig. 2 shows these lining-blocks, which may each have a hole through which a fastening-screw or rivet may be inserted, and d cl projections from the surface of the blocks. When put in place within the oven the disposition of the blocks is as shown in Fig. 1, 0 representing the blocks, r r a side and bottom of the oven-casing. By this arrangement air-spaces n n are obtained, and as the joints 0 between the blocks 0 are not closely fitted, the result is a free circulation of the air confined within the oven, so that the blocks are notahindrance to the heating of the oven, but they become heated with it. \Vhen heated their capacity for retaining heat maintains a more uniform temperature in the oven, which does not fluctuate with every change in the heating medium. These lining-blocks,

being made of porous material, possess another quality yet superior to that of regulat- Gases which are geneing the temperature.

rated in the oven during the processes of roasting and baking are absorbed by the porous oven-lining instead of by thefood that is being, prepared, and the result is sweeter and more wholesome food, equal in quality to that prepared in brick ovens.

It is obvious that no particular form is essential to obtain the circulation of the air back of the lining-blocks. A corrugated surface would answer as well as the form of projections shown in Fig. 2. I propose to make these lining-blocks of porous porcelain, terracotta, or other like suitable materials. When the clay is not of itself sufficiently porous I can produce any degree of porosity by inter mixing with it fine coal, sawdust, or meal, which will be displaced in the act of burning the blocks. These linings may be made in single blocks large enough to cover a bottom, side, or top of an oven, where means for aircirculation may be afforded by perforations through the blocks. I do not purpose glazing any part of the lining.

I do not wish to be restricted to any form of construction herewith shown, so long as the spirit of the invention is not departed from. .1.

Having described my invention, what I claim, and desire to secure by Letters Patent,

III combination with the oven-plates of a stove, the unglazed porous lining-plates 112W- ing projections on their reverse side to pro vide an air-space between the oven'plates and the lining-plates, substantially as and for the purpose set forth.

ROBERT MAOKELLAR.

Witnesses:

NELSON G. FIsIIER, WILLIAM H. CLINTON. 

